Secondly, if it is a normal size, generally one plate is needed for one color, for example, two plates are needed for two-sided printing of a package. A simple supermarket bag is generally 80 RMB per plate. If you are printing with a compound bag, the plate-making cost needs to be calculated according to the size of the bag. One square centimeter is about 0. 14 yuan, and the specific calculation is a primary school topic.